Sun Valley to Alliance Road Trip: Idaho to Nebraska Guide

Along the 16-mile-long Sawtooth Scenic Byway, Sun Valley's ski slopes give way to sagebrush plains. This route traces US-26 east to US-20, then I-80 across Wyoming, before descending onto the Nebraska Panhandle. The entire passage spans roughly 750 miles—about 11 hours of driving without stops.

A little-known fact: The Oregon Trail runs parallel to much of US-26 through Wyoming. Pioneers faced the same sweeping emptiness you'll encounter east of the Continental Divide. Their ruts remain visible near Guernsey.

From Sun Valley, take ID-75 to US-20 east to I-84 at Twin Falls. Merge onto US-30 and US-26 eastward. At Rawlins, turn onto WY-789 and I-80. Exit at Cheyenne onto US-85 north, then NE-71 to Alliance.

Fuel stations are sparse east of Rock Springs; fill up every 150 miles. Diesel is available at most truck stops along I-80. Expect gas prices to drop $0.20 per gallon as you leave the mountains.

• Segment 1: Sun Valley to Rawlins (4.5 h) – one fuel stop near Little America.
• Segment 2: Rawlins to Alliance (6.5 h) – refuel in Cheyenne and Torrington.

Toll roads: None. Avoid I-80 through Laramie if you dislike elevation; US-287 offers an alternative.

Leaving Sun Valley, the Big Wood River accompanies you through the Sawtooth foothills. As you cross into Wyoming near Alpine, the Snake River winds through canyons. The Wind River Range appears on the northern horizon.

Beyond Rawlins, the Continental Divide at 7,000 ft marks the watershed. The Great Divide Basin is a closed basin where water never reaches the sea.

• Hell's Half Acre: A 200-foot-deep chasm near Casper. Worth a 20-min detour.
• Independence Rock: A granite monolith where pioneers carved their names; parking off WY-220.

Local commerce: In Sun Valley, visitor spending hits $1,500 per day per party. In contrast, Alliance's economy revolves around agriculture—sugar beets and dry beans.

Open-range livestock zones are common east of Lander, especially at dawn and dusk. Speed drops to 55 mph near grazing areas. High winds on I-80 between Rawlins and Laramie can exceed 50 mph; keep both hands on the wheel.

For family: The Legacy of the Plains Museum in Gering, NE offers interactive homesteading exhibits. At Chimney Rock, kids climb the visitor center tower for panoramic views.

• Chimney Rock: 300 ft tall; short paved path from parking.
• Scotts Bluff National Monument: 4-mile hike to summit; bring water.

Pet-friendly: Most state rest areas have leash-free zones. The Rawlins WY rest area has a dedicated pet exercise area.

Fatigue management: Rest stops every 50 miles on I-80; use the 'Alive at 25' rest zone near Pine Bluffs. Avoid driving between 1–4 p.m. (lowest vigilance) and 11 p.m.–5 a.m. (cattle crossing risk).